function open_close (i_this,i_content_id)
{var w_content = document.getElementById("list_"+i_content_id);
if (w_content.style.display == "none")
{w_content.style.display = "";i_this.style.backgroundImage = "url(/cc/minus.gif)";}
else {w_content.style.display = "none";i_this.style.backgroundImage = "url(/cc/plus.gif)";}}